Q501. What happens If I pass string type for getPrototype method?
In ES5, it will throw a TypeError exception if the obj parameter isn't an object. Whereas in ES2015, the parameter will be coerced to an `Object`. ```javascript // ES5 Ob...
Technical Question Bank · Peer-Reviewed
Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (780 available).
Active:
Tag: js ×
Q502. How do you set the prototype of one object to another?
You can use the `Object.setPrototypeOf()` method that sets the prototype (i.e., the internal `Prototype` property) of a specified object to another object or null. For ex...
Q503. How do you check whether an object can be extended or not?
The `Object.isExtensible()` method is used to determine if an object is extendable or not. i.e, Whether it can have new properties added to it or not. ```javascript const...
Q504. How do you prevent an object from being extend?
The `Object.preventExtensions()` method is used to prevent new properties from ever being added to an object. In other words, it prevents future extensions to the object....
Q505. What are the different ways to make an object non-extensible?
You can mark an object non-extensible in 3 ways, 1. `Object.preventExtensions` 2. `Object.seal` 3. `Object.freeze` ```javascript var newObject = {}; Object.preventExtensi...
Q506. How do you define multiple properties on an object?
The `Object.defineProperties()` method is used to define new or modify existing properties directly on an object and returning the object. Let's define multiple propertie...
Q507. What is the MEAN stack?
The MEAN (MongoDB, Express, AngularJS, and Node.js) stack is the most popular open-source JavaScript software tech stack available for building dynamic web apps where you...
Q508. What is obfuscation in javascript?
Obfuscation is the deliberate act of creating obfuscated javascript code(i.e, source or machine code) that is difficult for humans to understand. It is something similar ...
Q509. Why do you need Obfuscation?
Below are the few reasons for Obfuscation, 1. The Code size will be reduced. So data transfers between server and client will be fast. 2. It hides the business logic from...
Q510. What is Minification?
Minification is the process of removing all unnecessary characters(empty spaces are removed) and variables will be renamed without changing it's functionality. It is also...